elasticsearch/docs/reference/elasticsearch-plugins/analysis-kuromoji-stemmer.md

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---
mapped_pages:
- https://www.elastic.co/guide/en/elasticsearch/plugins/current/analysis-kuromoji-stemmer.html
---
# kuromoji_stemmer token filter [analysis-kuromoji-stemmer]
The `kuromoji_stemmer` token filter normalizes common katakana spelling variations ending in a long sound character by removing this character (U+30FC). Only full-width katakana characters are supported.
This token filter accepts the following setting:
`minimum_length`
: Katakana words shorter than the `minimum length` are not stemmed (default is `4`).
```console
PUT kuromoji_sample
{
"settings": {
"index": {
"analysis": {
"analyzer": {
"my_analyzer": {
"tokenizer": "kuromoji_tokenizer",
"filter": [
"my_katakana_stemmer"
]
}
},
"filter": {
"my_katakana_stemmer": {
"type": "kuromoji_stemmer",
"minimum_length": 4
}
}
}
}
}
}
GET kuromoji_sample/_analyze
{
"analyzer": "my_analyzer",
"text": "コピー" <1>
}
GET kuromoji_sample/_analyze
{
"analyzer": "my_analyzer",
"text": "サーバー" <2>
}
```
1. Returns `コピー`.
2. Return `サーバ`.